Stirring device for dry anaerobic fermentation

Abstract

The invention discloses a stirring device used for dry anaerobic fermentation, and belongs to the field of environmental protection equipment. The device comprises a stirring shaft, a drive device and a plurality of T-shaped blades, wherein two ends of the stirring shaft are arranged in a reaction pool through a bearing assembly, the drive device is connected with the stirring shaft and is used for driving the stirring shaft to rotate, and each T-shaped blade is spirally and fixedly arranged on the stirring shaft at a constant angle in the axial direction of the stirring shaft. By spirally and fixedly arranging the plurality of T-shaped blades on the stirring shaft at the constant angle in the axial direction of the stirring shaft, the stirring device can improve a material stirring and mixing effect in axial and radial directions, and is convenient for material output. The stirring device is simple in structure and convenient to manufacture, maintain and overhaul.

Description

technical field [0001] The invention relates to the field of environmental protection equipment, in particular to a stirring device for dry anaerobic fermentation. Background technique [0002] As far as the current domestic and foreign organic waste treatment and disposal processes are concerned, anaerobic fermentation is a very ideal process. Due to its advantages of high organic load, low investment, and low energy consumption, dry anaerobic fermentation has become popular in China in recent years. developed rapidly. According to the way of material in and out, dry anaerobic fermentation has two process forms: continuous and sequence batch, while the reactor of sequence batch process is mostly garage type, and it is mainly used for solid content of more than 25% and For organic waste with a large particle size distribution range and good permeability, the continuous process is mainly used for organic waste with a solid content of 15% to 25%, relatively viscous material a...

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Problems solved by technology

At present, pneumatic agitation and mechanical agitation are generally used for material agitation in horizontal dry anaerobic fermentation reactors. Pneumatic agitation is to blow the biogas generated by the system into the reactor in the form of pulses after pressurization. The impact force of the airflow completes the stirring and mixing of the materials, which not only consumes a lot of energy, but also easily generates scum in the reactor, resulting in poor gas outlet. In addition, because the blowing is intermittent, the air inlet is prone to blockage, resulting in system failure. It cannot operate normally, so this stirring method is rarely used in actual projects, most of which are mainly mechanical stirring, and the common mechanical stirring blades used in dry anaerobic reactors are mostly ribbon type and multi-blade The blades are arranged in a helical line with equal intervals, while the spiral ribbon blades are not only difficult to process and high in production cost, but also limited by the material itself, the agitator cannot be used in large-scale projects, while the multi-blade equidistant helix Arranged agitators have disadvantages such as unsatisfactory axial stirring and mixing effect and poor matching with anaerobic biological reaction process, which makes the digestion and degradation rate of organic matter low

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